That's a great point. In that case, I would prefer a video conference call or an online service that allows collaborators to share a paint canvas or some other

That's a great point. In that case, I would prefer a video conference call or an online service that allows collaborators to share a paint canvas or some other kind of unrestricted drawing board. Again, this is personal preference, but I prefer text for writing out proofs and something visual and more freeform for brainstorming.